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3 Sheets-Meet 1.

(NO Model.)

A. D O B BIB. HOISTING MAUHINE.

Patented Anr. 4, 1882.

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V HOISTING MAGHINE. No. 255,844. Patented Ap r. 4,1882;-

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(No Model.)

A. BOBBIE.

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HOISTING MACHINE.

Patented Apr. 4,1882.

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UNITED STATES PATENT OFFICE.

ARGHIBALD DOBBIE, or THOROLD, ONTARIO, CANADA.

HOISTING-MACHIN E.

SPECIFICATION forrning part of Letters Patent No. 255,844, dated April 4, 1882.

Application filed December 20, 1881. (No model.)

To all whom it may concern:

Be it known that I, ARGHIBALD DOBBIE, of Thorold, in the county of Welland, in the Province of Ontario, Canada, have invented new and useful Improvements in Hoisting-Machines, of which the following is a specification.

This invention relates more especially to improvements in that class of hoisting-machines which are provided with two separate drums, upon one of which is wound the rope by which the load is raised, and upon the other of which is wound to rope by which the end of the booin of the derrick is raised, to which the tackle supporting the load is attached.

The object of this invention is to simplify the construction of this class of hoisting-machines and to render such machines more convenient and reliable in operation; and inyinvention consists, to that end, of the particular construction hereinafter described, and pointed out in the claims.

In the accompanying drawings, consisting of three sheets, Figure l is an elevation of my improved hoisting-machine. Fig. 2 is a top plan view, and Fig. 3 a longitudinal vertical section, thereof. Figs. 4 and 5 are vertical sections in lines to a and y y, Fig.1, respect ively. Fig. 6 is a fragmentary sectional view of the friction-brake. Fig. 7 is avertioal crosssection in line to 20, Fig. 1, looking toward the left. Fig. 8 is a vertical cross-section in line a 2, Fig. 1.

Like letters of reference refer to like parts in the several figures.

A represents the bed-frame of the machine, composed of sills a and cross-pieces (6 a a 1) represents the vertical driving-shaft, and B thecross-head, secured to the upper end thereof for the reception of the sweeps B, to which the horses are attached when the machine is driven by'horse-power.

G represents an arched standard,in which the vertical driving-shaft b is supported. The standard 0 rests at both ends on the sills a and at the middle on the cross-piece a by feet or legs 0 c.

D represents the drum upon which the rope is wound by which the load is suspended, and E represents the drum upon which the ropeis wound whereby the boom ofthe derrick is raised and lowered. d represents the horizontal shaft whereby both drums are rotated. The shaft d is supported atits ends in standard-bearings f, and between the drums in abeaI-in-g,j", which is formed in the arched standard 0. The upper portion of the bearing f is provided with a step-bearing, f in which the lower end of the vertical shaft b turns, the upper end ofthe shaft b turning in a bearing, b, formed in the standard 0.

9 represents a bevel-pinion secured to the vertical shaft 1), and g a bevel-wheel secured to the horizontal shaft cl, and gearing with the pinion g, whereby the shaft (1 is rotated from the shaft b. I

H represents the movable part of a clutchcoupling, which slides on a feather, h, in the shaft 61, and engages with a corresponding part, H, formed at or secured to theinner end ot'the drum D, which latter turns loosely on the shaft d.

I represents the shifting-lever, which engages with the movable part H of the clutch, and which is pivoted in a standard-bearing, 1'.

The drum D is preferably constructed with a spiral groove for the reception of the rope which is wound upon the drum.

K is a horizontal counter-shaft provided with a pinion, k, which meshes with a gear-wheel,

K, formed with or secured to the drum D.

Thecounter-shaft K is supported near its outer end in a standardbearing, Z, and at its inner end in abearing,l,cast with the arched standard O. I

M is a friction-wheel secured to the countershaft K near its inner end; and m is a handbrake, which surrounds the wheel M, and is tightened by a lever, m. The brake consists of a band of wrought-iron, W, to the inner side of which are secured blocks of wood m which bear against the face of the friction-wheel M. The band is held away from the wheel by a spring, m, which presses the outer end of the lever m upward. Upon disconnecting the drum D from the shaft d by shiftingthe clutch H the descent of the load is controlled by the brake. The outer end of the counter-shaft K is provided with a hand-crank, 1 whereby the shaft K and the drum D can be turned by hand,

when the latter is disconnected from the shaft d, for the purpose of taking up the slack of the rope.

N represents the movable part of a clutchcoupling', which slides on afeather, a, secured I in the shaft d, and engages with acorresponding part, N, formed at or secured to the inner end of the drum E, which latter also turns loosely on the shaft d.

0 represents the shifting-lever, which engages with the partNof theclntch, and which is pivoted at 0 to the arched standard (J. The drum E ispreferablyconstructed with a smooth cylindrical surface.

P represents a friction-rim cast on or secured to the inner end of the drum E, and 19 a bandbrake, which surrounds the rim P, and which is attached to a lever, 19, pivoted at 19 whereby the brake is applied when required. The handbrake p is constructed of a band of wroughtiron and blocks of wood attached thereto, as hereinbefore described with reference to the brake m.

Q represents a ratchet-wheel cast with or secured to the inner end of the drum E, adjacent to the friction-wheel; and qrepresents the pawl, which is pivoted at q, and which engages with the ratchet-wheel and prevents the drum E from rotating in the direction in which tth rope runs otf.

The levers which control the clutches and friction-brakes are all located in close proximity' near the center of the machine, where they can be conveniently operated by one attend ant.

Either drum may be rotated independent of 5 the other, and either or both can be instantly stopped and held in any desired position by the attendant, thereby giving full control over the movements of the load and derrick-boom.

It is obvious that the shaft 61 may be rotated by steam-power, if preferred.

I claim as my invention- 1. The combination, with the drums D and E, mounted loosely upon a shaft, 01, ofthe driving-shaft I), gear-wheels g g, clutch-couplings H N, counter-shaft K, pinion 7c, and brakes M m and Pp, substantially as set forth.

2. Thecombination, with the drum D, mounted loosely on the shaft d and provided with gear-wheel K, clutch H, driving-shaft b, and gear-wheels g g, of the counter-shaft K, provided with pinions k and hand-crank 1, substantially as set forth.

3. The combination, .with the drums D E and shafts b (I, of the arched standard 0, provided with bearings I) f f arranged between the drums and end bearings,f, substantially as set forth.

A. DOBBIE.

Witnesses:

JNo. J. BONNER, EDW. J. BRADY. 

